Reproducing apparatus



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29 E. l. sPoNABLE 73639 'REPRODUCING APPARATUS Filed July 27, 1927 Patented Nov; 1e, 1929,

y UNITED EARLv I. SPONABLE, OF YORKpN. Y., ASSIGNOR TO FOX-CASE CORPORATION', OF

NEW YORK, N. Y., A CORPORATION F NEWKYORK REPRODUCING APPARATUS Application mea July 27,

This invention relates to certain new and useful improvements in apparatus for reproducing a photographic record of light wave varlations.

In such apparatus it is customary to move the yfilm bearing or to bear therecord past an extremely narrow slit, and where a slit unit has been inset in one of the tracks over which the film rides in its movement, the exposed corners of the slit unit have scratched Vand scraped the film so as to injure the film, and

have removed material from the film which collects adjacent the slit, and is objectionable. The main object of this invention is to provide a slit unit so arranged and supported that the film may move over it without con-1 tact with any corners or sharp portions which would tend to remove material from the film.

Other objects and advantages relate to thel details ofthe structure, form and -relation of the parts thereof, all as will more fully appear from the following description, taken in connection with the accompanying drawings, in .whichz- Fi re 1 is a plan view of the structure of this invention.

Figure 2 is a section on line 22, Figure 1.

Figure 3 is a section on line 3 3, Figure 1.

Figure ,4 is an enlarged section similar to Figure 3 through the slit unityand a portion' ofthe base or shoe.

So far as the'base here illustrated and its method of support as by integral flange is concerned, the disclosure is merely illustrative, as the invention relates to the particular relation of the slit unit and the base and the manner in which the lformer is supported by the latter.

These tracks 2f and -3- are spaced by an intermediate depressed portion `5-. Heretofore, it has been proposed to inset a small rectangularl slit unit in the track 2 vso that one edge of the film rides over the slit unit, but as stated, the exposed corners of this slit unit tend to injure the film and cause the collectionu of foreign matter adja- 1927. Serial No. 208,759.

cent'the slit, and, for the purpose of eliminating these disadvantageous features the vshoe -1- is formed with a transverse groove or channel -6- extending throughout the t width of the shoe, and the outer edges -7- and -8- of the side walls -9- and -10- bordering the channel are curved outwardly portions of the groove -6-. A layer 2S- of opaque material is placed upon the front surface of the base --12-. Preferably, this is effected by ,vaporizing and depositing an extremely thin layer'of metal on the quartz base l2- A minute slit 2.4- isthen ruled in this metal layer so as to expose the quartz base, and this slit is of the length desired tol limit the width of the resultant photographic record of light wave variations, as for instance, 116th of an inch in length, such record being usually produced at one side ofy the pictures photographed upon a moving picture lm.

A cover plate -15- of quartz or the like is then placed over the opaque layer -13- and is secured in place in any suitable manner, as by adhesive or cement, and is then ground down to an extreme thinness as for instance, half a thousandth of an inch in thickness.v Preferably, the front face of the base 12- is convex and when the cover` plate -15- is ground down, it is ground upon similar convex lines so that the opposite ends 16 and 17 lie beneath the adjacent surfaces of the shoe -1-.

As stated,`the groove -6- extends transversely of the shoe throughout its entire width or at least a sucient len h so as to extend upon opposite sides of a lm adapted to move over the shoe, and the slit unit consisting of the base -12-., opaque layer 13,J and cover plate -15- is of a similar length so as to extend upon opposite sides of the -1, and preferably as shown, the slit unit is formed to fit the groove -6-, and may be slid endwise into thegroove, and secured in the desired position by adhesive, cement or the like.

As shown, the slit unit is of the same len `h as the width of the shoe-1 The m in its movement has substantially line contact with the apex of the convex cover plate -'--15 and the slit is directly beneath and ,aligned with the apex, and the cover plate forms a support for the film intermediate the tracks of the shoe, which tracks are separated by the groove .-6-, and as the slit unit extends at opposite' sides of the lm, there are no corners underlying the film which would act to remove material from the film, or to cause the collection of foreign matter adjacent the slit.l

It is found that with this apparatusa better and more satisfactory film record 1s produced, and altho I have shown and described -a specific construction, form and relation of parts thereof as constituting .a perhaps preerred embodiment of this invention, l do not desire to restrict myself to the details thereof for'the reason that the broad feature of the invention consists in having a slit unit structure which extends to opposite sides of lthe'filirn so that no corners underlie the film,

and for that reason variations, changes and modifications may be made in'thedetails of the structure without departing from the spirit of the invention as set forth in the appended claims. n

- I claim:

a 1. An apparatus for producing a photographic record of light wave variations corresponding to sound wave .variations com prising a base having longitudinal tracks separated by a longitudinally depressed portion, said base provided with a laterally disposed recess extending across. the depressed portion of the base and into the track portions a distance suflicient to permit its projection upon opposite sides of a film moving over said tracks, and a slit unit ysecured in said recess portion and extending upon opposite sides of film movin over said base, said slit unit contacting an being a support for the film.

2. An apparatus for producing a photographic record of light wave variations corresponding-to sound wave variations comprising a base having longitudinal tracks separated by a longitudinally depressed portin said base provided with a laterally disposed recessextending from side to` side of said base, and a slit unit fitted into said recessed portion and extending throughout substantially the entire width of the base, said slit ipit contacting and being a support for the 3. apparatus for producing a photographic record of light wave variations corresponding to sound wave variations 'comprising a base having longitudinal tracks separate-d by a longitudinally depressed (portion, said base provided with a laterally isposed recess extending across the depressed portion of the base and into the track port1ons a distance sufficient to permit its projection upon opposite sides of a film moving over said tracks, the outer ortion of the'opposite edges of the walls of t e recess being beveled in opposite directions, and a slit unit secured in said recessed portion and extending upon opposite sides ofy a film movin over said base, said slit unit contacting and being a support for the film.

4. An apparatus for producing a photographic recordof light wave variations corresponding to sound wave variations comprising a base having longitudinal tracks Separated by a longitudinally depressedv portion, said base provided with a laterally disposed recess extendingacross the depressed portion of-the base and into the track por-i tions a distance sufiicient to permit its projection upon opposite sides of a film'moving over said tracks, and a slit unithaving an outer surface convex longitudinally of said tracks secured in said recessed portion and extending upon opposite sides of a film moving over said base, said slit unit contacting and being a support for the film.

5. An apparatus for producingl a photographic record of light wave variations corresponding to sound wave variations comprisin a base having longitudinal tracks separate Aby a longitudinally depressed portion, said base provided with a laterally disposed recess extending across the depressed tion of the base and into the track port1ons a distance sufficient to permit its projection upon op osite sides of. a lm moving over said trac s, the outer ortion of the o posite edges of the walls Vof t e recess being veled in opposite directions, and a slit unit secured in said recessed portion 'and extending upon opposite sides of' al film moving over said base, said slit unit contacting and being a support for the film, said slit unit havin its outer surface convex longitudinally o the ytracks and its opposite edges disposed beof the walls of the recess being beveled in l /opposite directions, and a slit unit secured News@ in said recessed perion and exendimg upon opposite sides of a iiim moving @ver seid bese, said slizlunit having its enter surface eemvex lonitudinaily of the tracks and its cop-4 5 posite e ges disposed beneath the level of the tracks, and its apex lpm'siorn disposed sub stantielly` ush with the-'tracks and in een tact wijt'i zhe film.

' En Witness wheree 'A' have hemmt@ set my w Ahand this 20th 'day' of July 1927.,

.1, EARL'L SPNABLE: 

